Quite hard to imagine for me. Corporations don't have an ideological framework underneath ("we the people..."), so they are going to get overpowered any time push comes to shove.
To organise the world's information and make it universally accessible and useful - Google
To enhance the lives of our people, members, customers, and the communities in which we trade - Co-op group
Give people the power to build community and bring the world closer together - Facebook
To support national and international security policies that protect those who are defenseless and provide a free voice for all with a dedication to providing ethical, efficient, and effective turnkey solutions that positively impact the lives of those still caught in desperate times - Blackwater
I would argue all of the (along with the generic maximizing shareholders value obviously.) are concrete expressions of specific underlying ideologies. Roughly speaking these are that information should be universally accessible, corporations should benefit not just their shareholders, the world would be better if we were all one big family (very dubious!), and being a mercenary is fine as long as you're an "ethical" mercenary, whatever that means.
That we often don't see these as ideologically motivated statements is just because they are all, to a greater or lesser extent, in line with the dominant ideologies of our time, capitalism and liberal democracy.
Congress fed up with how corporation treats citizens? Some unions?
The only thing I could imagine is the other corporation. Not much more.